Meaning of wéi:
唯
only; alone; yes
Zài zhèxiē shíwù zhōng, wǒ wéi dú xǐhuān píngguǒ.
在这些食物中,我唯独喜欢苹果。
Among these foods, I only like apples.
Tā shì zhège xiàngmù zhōng wéi yī de xìngcúnzhě.
他是这个项目中唯一的幸存者。
He is the sole survivor of this project.
Zhè jiàn shìqing zuì zhòngyào de shì yào yǒu yī gè míngquè de wéi yī de jiějué fāng'àn.
这件事情最重要的是要有一个明确的唯一的解决方案。
The most important thing about this issue is to have a clear and unique solution.
-ism (in Chinese, a prefix, often combined with a suffix such as 主義|主义[zhu3 yi4] or 論|论[lun4], e.g. 唯理論|唯理论[wei2 li3 lun4], rationalism)
Tā duì zhéxué de xìngqù jízhōng zài wéixīn zhǔyì shàng.
他对哲学的兴趣集中在唯心主义上。
His interest in philosophy focuses on idealism.